MS-0500

A 75-year-old man presents to the emergency department with acute chest pain that is radiating to his left shoulder. He has a medical history of a previous transient ischaemic attack three years ago and is currently taking aspirin 75mg OD.

Upon initial assessment, an ECG reveals ST-segment elevation in V1-V3. The patient undergoes percutaneous coronary intervention with a drug-eluting stent and is stable post-procedure. His treatment plan includes ramipril, ticagrelor, simvastatin, and atenolol.

What is the mechanism of action of the newly prescribed antiplatelet medication?